I've had trouble linking it to my iCal. Unfortunately, they have no live support to help me fix the issue, so I'm exchanging an email a day to get the problem resolved. Most of the recommended fixes are already in place, but when people schedule on TidyCal, my iCal doesn't show it. A real-time conversation could probably fix it, but I'm going on week two of not being able to use what I paid for and going through a lot of hassle at the same time. Very disappointing.